backup

#! /bin/bash

# TODO: Make sure aescrypt is installed BEFORE starting!!!!
# TODO: Exclude Microsoft and Slacks' shitty hidden cache
# .config/Microsoft/Microsoft Teams/Service Worker/CacheStorage/
#  ./snap/slack/62/.config/Slack/Service Worker/CacheStorage
# TODO Use pigz to enable multithreaded compression. 
# Update the restore file to do the same.
# gz:   tar -I pigz -cf tarball.tgz files
# https://www.peterdavehello.org/2015/02/use-multi-threads-to-compress-files-when-taring-something/
# TODO Check the external media is available before starting.
# TODO Convert to python

# This first argument becomes part of the output filename.
# I used the words 'odd' for odd-numbered days, or 'even'
# or 'monthy' or 'quarterly', depending on when chron runs
# the backup job.

if [ -z "$1" ]
then
	NAME="now"
else
	NAME="$1"
fi
echo "Setting backup name to $NAME"

TAR_FILENAME="/tmp/backup-$NAME.tar.gz"
CHANGE_TO=/home/aaron

# BACKINGUP is a the directory (or file) relative to the CHANGE_TO
# directory that will be tarred, zipped, and encrypted (archived).
# When BACKINGUP is set to the dot '.' (current dir),
# an archive is created for the entire CHANGE_TO directory.

BACKINGUP=.
ENCRYPT_FILENAME="$TAR_FILENAME.aes"
EXT_FOLDER=/media/aaron/HOFFER_BACKUP
PASSWORD=$(cat /home/aaron/password)

# Save the scripts that handle the backup and restore. 
mkdir -p "$EXT_FOLDER/scripts" && cp /home/aaron/.local/bin/{backup,restore} "$EXT_FOLDER/scripts"


echo "...Backing up $BACKINGUP to $TAR_FILENAME"

# The option "C" tells tar to change directory so the package content will be unpacked there
tar cz --verbose -C "$CHANGE_TO" -f "$TAR_FILENAME" --exclude='.m2/repository' --exclude='.cache' --exclude='.local/share/Trash' --exclude='VirtualBox VMs' "$BACKINGUP"

if [ $? -eq 2 ]; then
	echo Tar command failed. Exiting now.
	exit 1
fi

echo "...Created $(ls -sh "$TAR_FILENAME") ..."

echo "...Encrypting file as $ENCRYPT_FILENAME"
aescrypt -e -p $PASSWORD -o "$ENCRYPT_FILENAME" "$TAR_FILENAME" 
if [ $? -ne 0 ]; then
	echo Encryption failed. Exiting now.
	exit 2
fi

#TODO Use rsync instead of copy because it is resumable.
# Change move to copy. It's nice to have the latest on the local drive in case an ext drive is not handy
echo "...Copy $ENCRYPT_FILENAME to $EXT_FOLDER"
cp -f "$ENCRYPT_FILENAME" "$EXT_FOLDER"
if [ $? -ne 0 ]; then
	echo Could not move file to backup folder. Exiting now.
	exit 3
fi
echo ...Done!